The original sea sampler, as described by Spilhaus (1940), consisted of six bottles, each built somewhat like a small version of a standard Nansen bottle. These surrounded a cylinder containing a releasing block which was operated by an ordinary bathythermograph pressure element. The tripping block, which was moved by the pressure element, was scored and grooved to accommodate a series of triggers, one for each bottle, which closed the stop-cocks in turn as the whole instrument reached predetermined pressures....
Spilhaus, Athelstan F., and Arthur R. Miller. 1948. "The sea sampler." Journal of Marine Research 7, (3). https://elischolar.library.yale.edu/journal_of_marine_research/676